Doing the Marathon Des Sable or the Atacama Crossing then the Outdoor Research Sun Runner is the hat for you. UPF 30 sun protection in the form of a large peaked cap with a removable, adjustable skirt gives you shelter from the suns harsh rays. The skirt can be pulled to fully cover your face and neck for ultimate sun protection. Mesh panels in the side of the cap let air flow over the sides of your head for a perfect combination of cool draft and shade.